Go4Expert - Bash Simple Tricks (Continuation)

This is continuation of my previous articles .. Please don't miss them :-

Again I am following a question – solution approach to demonstrate my scripts..

Scripts

How to 'cat'(print) all the files in a folder

Solution :-

Code:

#!/bin/bash 



cat `ls`

ls output :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ ls 

char2.sh  displayA.sh  endZ.sh  file1  ls.sh  vovelFile.sh

Running :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ ./ls.sh 

#!/bin/bash 



cat $1 | grep '..[eE]' | wc -l 

#!/bin/bash 



cat $1 | grep ^[aA] | wc -l 

#!/bin/bash 



cat $1 | grep [z]$ | wc -l 

aaessss 

aaaesss 

aaaaaaaa 

lionaneesh 

ssssssssss 

#!/bin/bash 



cat `ls` 

#!/bin/bash 



ls | grep ^[aeiouAEIOU] | wc -l

cat(Print) all the .txt files in a folder

Solution :-

Code:

#!/bin/bash 



cat `ls | grep .txt`

ls output :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ ls 

char2.sh     endZ.sh  ls.sh     txt2.txt  vovelFile.sh 

displayA.sh  file1    txt1.txt  txt.sh

Using :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ sh txt.sh 

WOOOOOOWWWWWW!!! 



Its file no 1 named txt1 

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 

Hello !!!!!! Hi Wassup 



This is file no 2 named txt2

Write a bash script to display todays date and time..

Code:

aneesh@aneesh-laptop:~/articles/Bash$ cat date.sh 



#!/bin/bash



echo "Today is `date`"

Using :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ chmod +x date.sh 



aneesh@aneesh-laptop:~/articles/Bash$ ./date.sh



Today is Tue Feb 15 22:23:57 IST 2011

Write a bash script to output the date and time in audio format(speak)

Code:

#!/bin/bash



espeak "Today is `date`"

Using :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ chmod +x date2.sh 



aneesh@aneesh-laptop:~/articles/Bash$ ./date2.sh

Write a bash script to maximize all the windows opened after a specified no of seconds..

Solution :-

Code:

#!/bin/bash



sleep $1



maximus

Using :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ chmod +x maximise.sh 



aneesh@aneesh-laptop:~/articles/Bash$ ./maximise.sh 2

How to download youtube videos with bash ?

Code:

#!/bin/bash



youtube-dl $1

Using :-

Code:

aneesh@aneesh-laptop:~/articles/Bash$ chmod +x youtube.sh 



aneesh@aneesh-laptop:~/articles/Bash$ ./youtube.sh http://www.youtube.com/watch?v=m8Dd7rjmEW4